Zulkarnain, Z., W. A. Zakaria, D. Haryono, and K. Murniati. “Economic Efficiency and Risk of Cassava Farming in Lampung Province”. International Journal of Financial, Accounting, and Management, vol. 3, no. 2, Sept. 2021, pp. 129-48, doi:10.35912/ijfam.v3i2.433.